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  #41  
Old 28-10-2010, 02:59 PM
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CraigS
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Originally Posted by Suzy View Post
Just found out the answer to this one.
The 11th dimension is TIME. 10 dimensions + time. Doh! The string theory model doesn't work with anything other than these 11 dimensions.
Actually, I was just looking through the link Steven recommended on string theory in this thread and this guy says:

Quote:
The 26 dimensions required by "bosonic" string theory include time, so that means 25 dimensions of space instead of the three that we're familiar with. (And superstring theory describes "only" nine dimensions of space) …
… plus one for time = 11 dimensions. [EDIT: oops 9 + 1 = 10 .. got a bit ahead of myself there].

Not sure I've ever heard of this bosonic version of string theory, though.

Witten's version of M-Theory calls for 11-dimensions which unites all five competing string theories (and supersedes them).

Cheers

Last edited by CraigS; 28-10-2010 at 03:49 PM.
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  #42  
Old 28-10-2010, 03:18 PM
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Originally Posted by CraigS View Post
Witten's version of M-Theory calls for 11-dimensions which unites all five competing string theories (and supersedes them).
Cheers
Spot on exactly as I understood it. In the Foxtel show "Visions of the future", presented by Professor Kaku, he went on to say that this model will only work with this amount of dimensions- the others didn't cut it.

You would know this already, but for those who don't, the M theory name was invented by Witton and it stands for "magic".

Did you watch that series Craig? It was on recently. Brilliant!
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  #43  
Old 28-10-2010, 03:48 PM
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Quote:
Originally Posted by Suzy View Post
Spot on exactly as I understood it. In the Foxtel show "Visions of the future", presented by Professor Kaku, he went on to say that this model will only work with this amount of dimensions- the others didn't cut it.

You would know this already, but for those who don't, the M theory name was invented by Witton and it stands for "magic".

Did you watch that series Craig? It was on recently. Brilliant!
Suzy …

I don't know what was up with Kaku lately, he's been coming up with some pretty wild stuff .. I think commercialism may have caught up with him. I did see "Visions of the Future". It was pretty cool, though.

Ed Witten himself says: "that the interpretation of the M can be a matter of taste for the user of the name." In Elegant Universe they interview Witten about this and he says it could be magical, mystery (or a few other things), but its all according to taste. I think this is his way of distancing himself from it all .. given that even he says no-one understands it yet. I think he's spent the last few years coming up with new mathematics to deal with the multi-dimensionality of it all. I'd say he's the only one who could probably explain part of it, in our lifetimes.

But aside from the detail, I still don't get this 26 dimensions stuff in boson string theory ..!

Cheers
PS: Thanks for picking me up on my arithmetic 9+1=10, right .. not 11 ? Doh !!
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